Our current research adds another layer of enhancement over Pulsed Laser Line Scanning (PLLS) by partially rejecting the source-to-target forward scattering effects. The technique uses the same source as PLLS system, but the receiver consists of a linear array of n time-resolved bucket collectors in the cross-axis direction. The spacing between receive elements is large enough to cause measurable time-of-flight differences in the near-field. By using a near-field beamforming algorithm, which sums together the time-resolved receiver waveforms with the appropriate delays based on the geometry, the contrast ratio is improved and some of the multiple forward scattering induced blur/glow/ghosting effects are rejected as well as improving the time-of-flight based 3D image reconstruction. This paper utilizes modeling to investigate the feasibility of this method.
Walter B. Britton, Fraser R. Dalgleish, and Hanqi Zhuang, "Beamforming receiver for underwater pulsed laser line scanning," Proc. SPIE 10631, Ocean Sensing and Monitoring X, 106310L (Presented at SPIE Defense + Security: April 18, 2018; Published: 25 May 2018); https://doi.org/10.1117/12.2310055.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.
Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon